2004 Pontiac Grand Am Questions

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usually clicks one time then everything in the car is dead. after a few tries the car will start.
Typically when car is shut off, the head/tail lights will stay on for a short period of time. Yesterday, they decided to stay on no matter what. I flashed a flash light into the photo sensor and after a few seconds they shut off. Later that day, the same thing happened. I pulled the AUTO HDLPC and AUTO PRK relays from under the hood and now they seem to work as they should, but i have no tail lights. What seems more likely, the sensor being bad or one of the relays?
My 2004 Pontiac Grand AM GT has a P0420 code plus change oil light on. The Oil light came on first, and a day later, the check engine light came on. I checked the code and it was P0420 code, which is a catalyst efficiency low-bank which could deal with a bad catalytic converter or an engine misfire, large vacuum leak, or engine oil leakage into exhaust value guide. It does smell like burning oil when I open the hood. The oil was changed in the last month. What should I do? Has anyone had this problem before?
Car died, was told there's a chance valves are bent also and that won't be obvious until chain is replaced. Is this accurate information?
I have no other keys. Cannot find them. Key is not a computer chip.
When i push it it does not make a sound at all
i was driving and the vehicle lost power and wouldnt accelerate then the power steering went out i pulled over and turned it off now it wont even start
not much space and was wondering if i have to take out the aie filter unit
Checked fuses and auto manual. NO Blown fuses. Yet can not access power to these two devices
Could being out of gas have hurt it?
Could any one give me any pointers on where to start at to figure out why this happened??

A few things that was happening was:
The air conditioner would suddenly go hot then blow out cold air at any given time.
Sometime the belt would squeal upon start up but would quiet down when car warms up.
car is hard to start when first crunk up engines idles and sometimes dies it drives good when i kill it and retart it after driving it cranks up first turn
want start we tried both keys thinking it might be in the key but still same response
a bump or hole.
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